<style>
    .fl { float:left; height:30px; background:gray; }
    #A { width:90px; margin:0 10px; }
    #B { width:85px; margin-left:150px; }
    #C { width:100px; margin-left:100px; }
</style>
<div style="width:600px; height:30px; background:#CCC;">
    <div id="A" class="fl">10 90 10</div>
    <div id="B" class="fl">150 85 0</div>
    <div id="C" class="fl">100 100 0</div>
</div>